Is it just a VLAN issue? If so you may have a look at [4] since it is unrelated to SFP or caused by TOS.
Also, unless you got a CZ11NIC23 board revision (retails as Omnia 2019), it is currently required to manually activate the SFP Device Tree from the ssh cli with ln -sf armada-385-turris-omnia-sfp.dtb /boot/dtb && reboot
If none of the above is applicable perhaps you could elaborate on the matter?